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Energy is the ''work done''. It is [[power]] × time. | Energy is the ''work done''. It is [[power]] × time. | ||
Electrical energy is power (most commonly stated in watts) times a unit of time (most commonly one hour: watt-hours). 1,000 watt-hours equals one kilowatt-hour (kWh), which is the | Electrical energy is power (most commonly stated in watts) times a unit of time (most commonly one hour: watt-hours). 1,000 watt-hours equals one kilowatt-hour (kWh), which is the amount of power in watts transferred (or used) over 1 hour divided by 1,000. A MWh is equal to 1,000 kWh or 1,000,000 watt-hours. All other metric prefixes can also be applied, e.g., giga (billion), tera (trillion), and peta (quadrillion). | ||
For comparison or inclusion with other forms of energy. electrical energy can also be measured in joules (J), British thermal units (BTUs), and million [[tonne]] oil equivalent (mtoe). One petajoule (PJ) = 278 GWh. One quadrillion BTU (quad) = 293 TWh. One mtoe = 11,630 GWh. | For comparison or inclusion with other forms of energy. electrical energy can also be measured in joules (J), British thermal units (BTUs), and million [[tonne]] oil equivalent (mtoe). One petajoule (PJ) = 278 GWh. One quadrillion BTU (quad) = 293 TWh. One mtoe = 11,630 GWh. |